Manufacture of bodies containing metallic carbides



Patented Sept. 21, 1937 UNITED STATES MANUFACTURE OF BODIES CONTAINING METALLIC CARBIDES Gabriel Fodor, Paris, and Henri Garth, Neuilly sur Seine, France No Drawing. Application November 12, 1936, Se-

rial No. 110,550. In Great Britain November 16,

This invention relates to the manufacture of bodies containing carbides of metals belonging to the sixth group of the periodic system, and particularly tungsten monocarbide' adapted for use, for instance, in the tipping of turning tools by mixing the carbide reduced to an appropriate degree of fineness with a softer matrix metal such as iron, cobalt, nickel or the like, subjecting the mixture in the presence of a hydrocarbon such as benzene or other liquid which isinert to the constituents of the mixture, to a grinding treatment in a ball mill to obtain a finely divided and homogeneous product, removing the liquid therefrom, thereafter compressing the material in a mould, reducing the body to the desired shape by machining operations or the like, and subjecting the shaped body to a sintering operation at a temperature suflicient to give it the required degree of hardness.

According to the invention with the finely divided homogeneous material prior to compressing it in a mould, there is incorporated a. small proportion of water which is allowed to evaporate after the moulding and prior to the machining or like operations.

The proportion of water added to the finely ground material may, for instance, vary between from 1 to 5% and the water used will normally be distilled water.

For reducing the moulded bodies to the desired form machining operations, such as grinding or like' treatment, or filing or similar methods such as are customarily resorted to for the like purevenand {smooth surface free from cracks and exhibiting sharp angles.

What we claim is:

1. The process for the manufacture-of bodies containing carbides of metals belonging to the sixth group otthe periodic system, adapted for use in the tipping of turning tools which comprises mixing the carbide ofa-flnely divided hard metal with a softer matrix metal, subjecting the mixture in the presence of a liquid which is inert to the constituents of the mixture, to a grinding treatment'to obtain a finely divided and homogeneous product, removing the liquid there-- from, incorporating with the material a small proportion of water, thereafter at once compressing the moistened material in a mould, allowing it to dry at room temperature until a body sufficiently compact to be machined is obtained, reducing the body to the desired shape and thereafter subjecting the shaped body to a sintering operation at a temperature adapted to give it the required degree of hardness.

2. The process for the manufacture of bodies containing carbides of metals belonging to the sixth group of the periodic system, adapted for use in the tipping of turning tools which com prises mixing the carbide of a finely divided hard metal with a softer matrix metal, subjecting the mixture in the presence of a liquid which is inert to the constituents of the mixture, to a grinding treatment to obtain a finely divided and homogeneous material, removing the liquid therefrom, incorporating with thematerial 1 to 5%, of distilled water, thereafter at once compressing the moistened material, allowing it to dry at room temperature until a body suflicient- 1y compact to be machined is obtained, reducing the body to the desired shape and thereafter subjecting the shaped to a sir'itering operation at a temperature adapted to give it the required degree of hardness.

GABRIEL nonoa. mmm cam. 

